Quite a few people have had this issue. Is HPC on or off? Try switching it to the opposite of whatever it's currently set to. Also make sure to disable Core Performance Boost, C1E, and Cool&Quiet (though I leave this on). Also disable APM if you can find that in BIOS.

Believe if you use the AMD Overdrive software and disable AMD Turbo Core Technology this disables APM.

Changing HPC mode to OFF caused the throttling to happen IMMEDIATELY upon starting the prime95 test.

The change in clock was not as dramatic however, but it was consistent. About half the cores would run at 4.6 and the other half would run at 2.9 at any one time, and the VCORE would bounce from 1.5 to 1.368.

Hmmm... I might take a look at the inside of my case. See what I can do, since I'm basically done upgrading. I really do want a good picture also. Damned digital camera is no where to be seen, and I need something with flash.

Really would like a statement from Gigabyte about all this throttling on Rev. 3 boards. It has to be something with the BIOS/Software. AFAIK the VRM/mosfets are the same between both revisions unless someone knows otherwise.

Maybe they implemented some really strict VRM throttling/overheat protection in the 3.0 boards? But with an Enzotech MST-88 screwed on there and fans blowing on it you should have 0 problems with it overheating.

What button do you press to get into the BIOS for the UEFI boards? Wondering if there is hidden advanced settings like the old boards had. For the old boards its ctrl + F1/F2/Delete whichever key it is.